Profile Designs (a company more noted for tri/road bars - - and who also owns the Titec brand) makes one of the taller "plain" riser bars. Standard 25.4mm dia., so it will fit most standard (non-OS) stems and comes in a 60mm (almost 2½" rise) and a 10° sweep. Profile is a brand a lot of local shops carry because wholesaler QBP stocks them. Stop in yours and see if they have/can get them for you.